AmericanFortress published Provenance Proofs, research that lets a wallet prove its addresses on different chains share one hidden seed, without revealing keys or the link.
A bridge can verify that the payout address comes from the same wallet as the deposit before releasing funds, so an address swapped by a poisoned clipboard, hacked front end or insider gets rejected. Exchanges can also recognise repeat deposits from a vetted wallet. The proofs are post-quantum, and users choose how linkable to be.
A Bitcoin-to-Solana check takes about 13 seconds to prove and under a second to verify. It is research for now, with no live bridge integration yet.
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